Approximating the conditional distribution of person fit indexes for checking the Rasch model

被引:11
|
作者
Bedrick, EJ
机构
[1] Dept. of Mathematics and Statistics, University of New Mexico, Albuquerque
关键词
Edgeworth expansion; exact p-value; saddlepoint approximation;
D O I
10.1007/BF02295274
中图分类号
O1 [数学];
学科分类号
0701 ; 070101 ;
摘要
We present a simple approximation to the conditional distribution of goodness-of-fit statistics for the Rasch model, assuming that the item difficulties are known. The approximation is easily programmed, and gives relatively accurate assessments of conditional p-values for tests of length 10 or more. A few generalizations are discussed.
引用
收藏
页码:191 / 199
页数:9
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